rtliidios on iiiai'iiio O.slnicoils 247 



secondaiy spine at tli(> micltllc of each side, some somewhat shorter and broader proximal teeth, 

 cut off rather transversally distally. Dorsally, close to the end comb, the wall of the limb is 

 somewhat thickened and has a more or less weak chitinous wart. It is also somewhat concave 

 at this point, the depth of the concavity varying. The dorsal and ventral walls of the cavity 

 are not moveably joined to each other, but at least in some forms they may, however, be pressed 

 somewhat towards each other like a jaw, when the distal teeth of the end comb are pressed in 

 towards the dorsal wall of the cavity (see fig. 14 of C. (V.) megalops). This compression is 

 effected by a paired short, powerful muscle, which issues proximally somewhat proximo-dorsally 

 of the point of the limb and is fixed distally to the bottom of the cavity. This muscle is some- 

 times absent; whether in this case the distal teeth can be pressed in or not I am not able to decide, 

 as I have had only preserved material of these forms at my disposal; I merely point out here that 

 these teeth were not pressed in on any of the numerous specimens of species without this muscle 

 tliat I investigated, while they were pressed in very often on specimens of species with it. 



F u r c a: — The lamellae are moderately elongated. The number of claws fi'om about 

 nine to eleven, without, or in some cases with, division into main claws and secondary claws. 



Upper lip: — This has three glandular fields: an anterior one, unpaired, moderately 

 large, in which the exits of the glands are directed obliquely forwards and downwards, and two 

 pa ired ones, situated somewhat ventrally of the former, the exits of which are directed somewhat more 

 \'entrally. The two latter are sometimes comparatively small and situated distally on a couple of 

 large tusk-like processes, sometimes they are of moderate size and not raised; eveninthelast-men- 

 rioned case, however, the three fields of glands are separated from each other by rather deep groo- 

 ves. There is an unpaired protuberance on the front between the upper lip and the frontal organ. 



The rod- shaped organ is well developed and rather short and thick. 



The lateral eyes vary in their development; sometimes they are almost 

 completely reduced. 



Remarks: — Besides the three species described below we have probably to include in >''ii>nber of .-pecies 

 this sub-genus a rather large number of the species grouped together by G. W. MtJLLER in liis 

 work of 1912 under the generic name Cypridina. Of these species I merely mention here: 



Cypridina meditermnea, 0. Costa, 1845, (G. W, MOLLER, 1894, p. 206, pi. 2, figs. 1, 2. 



4, 5, 8—20, 22—27, 33). 

 dorsoserrata, G. W. Muller, 1908, p. 83, pi. IV, figs. 1—3, 5—10. 

 Sarsi G. W. Mt5LLER; G. 0. Sars, p. 43 (215), pi. Ill, figs. 1, 2, pi. VIII, figs. G, 7. 

 Vanhoffeni, G. W. MOller, 1908, p. 82. pi. V. figs. 1—8, 13. 

 sqmmosa, G. W. MtLLER, 1894, p. 207, pi. 2, figs. 3, 6, 7, 21, 28—32, 34— 3H. 

 Hilgendorfi, G. W. MtJLLER, 1890, p. 228, pi. XXV. fig. 9, pi. XXM. figs. 1—3, 



pi. XXVII, fig. 30. 

 A closer examination of these species will probably make it necessary to widen somewhat 

 the above diagnosis of the sub-genus. 



As the type of this sub-genus I consider the form described below under the name '''//"•■ 



('. (V.) norvegica. 



